In this post you will learn how to get help on functions in R.

## Getting Help on Functions –

There are many functions and it is impossible to remember each of them. Whenever you need help with any function in R, you can use

`help(funtionName)`

Let’s say you want to know about the mean function. To do that you have to write

`> help(mean)`

When you type the above code, this will open the help page for the** mean** function in the help pane in RStudio.

There is also a shortcut method to get help on a function. Simply type** ?** followed by the name of the function.

`> ?mean`

Sometimes you may also want to know the arguments of the function. To do that you can use the **args** function.

```
> args(mean)
function (x, ...)
NULL
```

Some time knowing the arguments is not enough and you want to know how to use a function. For that you can use **example** function.

```
> example(mean)
mean> x <- c(0:10, 50)
mean> xm <- mean(x)
mean> c(xm, mean(x, trim = 0.10))
[1] 8.75 5.50
```